Do I need separate restaurant inventory management software?

No. Restaurant inventory management is part of Get Menu and sits on the same screens as your menu, so a dish, what it uses, what it costs you and how many are left are one thing instead of four. Open Menu and you will find Inventory, Ingredients & suppliers, Recipes & food cost and Purchase orders along the top. Nothing to buy, nothing to connect, nothing to keep in step by hand. The docs tab Stock, recipes and suppliers walks through all four.